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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12806
Title: Energy storage performance of hybrid aqueous supercapacitor based on nano-Li2MnSiO4 and activated carbon
Authors: Chaturvedi P.
Sil, Anjan
Sharma, Yogesh Kumar
Published in: Ionics
Abstract: Novel asymmetric supercapacitor (ASC) composed of nanocrystalline Li2MnSiO4 (LMS) and activated carbon (AC) in aqueous electrolyte is investigated. ASC is tested in three different electrolytes, viz. 2 M KOH, 2 M LiOH, and 2 M Li2SO4. The aqueous solution of 2 M KOH is found to be an appropriate electrolyte in terms of better capacitance, cyclability, and rate capability probably due to a smaller hydration sphere radius and larger ionic conductivity of K+ ions. The electrochemical performance of ASC is examined using cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) cycling, and results are complimented with electrochemical impedance spectroscopy (EIS). Novel ASC exhibits the specific capacitance of 60 (±5) F g−1 at 3 mV s−1 in 2 M KOH. The excellent cyclability (till 5000 cycles) is also observed. The improved supercapacitive properties are mainly ascribed to the unique morphology of LMS (surface area ∼30 m2 g−1 and homogenous meso-pore distribution) which provides easy percolation of electrolytic ions to provide better formation of electric double layer with minor redox behavior. The ex situ X-ray diffraction (XRD) measurement was carried out on a cycled electrode to support the plausible reaction mechanism. © 2016, Springer-Verlag Berlin Heidelberg.
Citation: Ionics (2016), 22(9): 1719-1728
URI: https://doi.org/10.1007/s11581-016-1683-4
http://repository.iitr.ac.in/handle/123456789/12806
Issue Date: 2016
Publisher: Institute for Ionics
Keywords: Aqueous electrolyte
Asymmetric supercapacitor
Li2MnSiO4
Nanocrystalline
ISSN: 9477047
Author Scopus IDs: 56556144400
7003754102
7103066055
Author Affiliations: Chaturvedi, P., Energy Storage Laboratory, Department of Applied Science and Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India
Sil, A., Department of Metallurgical and Materials Engineering, IIT Roorkee, Roorkee, 247667, India, Centre of Nanotechnology, IIT Roorkee, Roorkee, 247667, India
Sharma, Y., Energy Storage Laboratory, Department of Applied Science and Engineering, IIT Roorkee Saharanpur Campus, Saharanpur, 247001, India, Centre of Nanotechnology, IIT Roorkee, Roorkee, 247667, India, Department of Physics, IIT Roorkee, Roorkee, 247667, India
Corresponding Author: Sharma, Y.; Energy Storage Laboratory, Department of Applied Science and Engineering, IIT Roorkee Saharanpur CampusIndia; email: yksptfpt@iitr.ac.in
Appears in Collections:Journal Publications [MT]

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